A drop-down menu in Gmail for iOS lets uses quickly reply to or print selected messages.

The new app offers auto-complete for email addresses in Gmail's own contact list or the device's native address book, alerts users of new mail via notifications, and supports Gmail's Priority Inbox, the feature Google debuted in August 2010 that automatically arranges messages to put the most important at the top of the queue.

On the iPad, the app shows the Gmail interface in a split view, with message headers on one side and their contents on the other.

When the iOS device is offline, users can compose new messages or open recently-read messages, said Google on the app's Help website.

The same site told Google Apps users with accounts created before November 2010 that they must migrate to the new accounts infrastructure to use the Gmail app. "Contact your Google Apps administrator if this app doesn't work with your Google Apps account," said Google.

As of 1:30 p.m. ET, the Gmail app could not be found by searching the App Store; to download it, steer to this URL, then click the button marked "View in iTunes."